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US9579984B1 - Control method of low voltage DC-DC converter for hybrid vehicle - Google Patents

Control method of low voltage DC-DC converter for hybrid vehicle Download PDF

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Publication number
US9579984B1
US9579984B1 US15/137,676 US201615137676A US9579984B1 US 9579984 B1 US9579984 B1 US 9579984B1 US 201615137676 A US201615137676 A US 201615137676A US 9579984 B1 US9579984 B1 US 9579984B1
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vehicle
output
controller
low voltage
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Dong Jun Shin
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Hyundai Motor Co
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Hyundai Motor Co
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    • B60L11/1811—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L58/00—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles
    • B60L58/10—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries
    • B60L58/12—Methods or circuit arrangements for monitoring or controlling batteries or fuel cells, specially adapted for electric vehicles for monitoring or controlling batteries responding to state of charge [SoC]
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L1/00—Supplying electric power to auxiliary equipment of vehicles
    • B60L11/1861—
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L50/00—Electric propulsion with power supplied within the vehicle
    • B60L50/50—Electric propulsion with power supplied within the vehicle using propulsion power supplied by batteries or fuel cells
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L53/00—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles
    • B60L53/20—Methods of charging batteries, specially adapted for electric vehicles; Charging stations or on-board charging equipment therefor; Exchange of energy storage elements in electric vehicles characterised by converters located in the vehicle
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L7/00—Electrodynamic brake systems for vehicles in general
    • B60L7/10—Dynamic electric regenerative braking
    • B60L7/12—Dynamic electric regenerative braking for vehicles propelled by DC motors
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60R—VEHICLES, VEHICLE FITTINGS, OR VEHICLE PARTS, NOT OTHERWISE PROVIDED FOR
    • B60R16/00—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for
    • B60R16/02—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements
    • B60R16/03—Electric or fluid circuits specially adapted for vehicles and not otherwise provided for; Arrangement of elements of electric or fluid circuits specially adapted for vehicles and not otherwise provided for electric constitutive elements for supply of electrical power to vehicle subsystems or for
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W20/00—Control systems specially adapted for hybrid vehicles
    • B60W20/10—Controlling the power contribution of each of the prime movers to meet required power demand
    • B60W20/13—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion
    • B60W20/14—Controlling the power contribution of each of the prime movers to meet required power demand in order to stay within battery power input or output limits; in order to prevent overcharging or battery depletion in conjunction with braking regeneration
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W30/00—Purposes of road vehicle drive control systems not related to the control of a particular sub-unit, e.g. of systems using conjoint control of vehicle sub-units
    • B60W30/18—Propelling the vehicle
    • B60W30/18009—Propelling the vehicle related to particular drive situations
    • B60W30/18109—Braking
    • B60W30/18127—Regenerative braking
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W40/00—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models
    • B60W40/10—Estimation or calculation of non-directly measurable driving parameters for road vehicle drive control systems not related to the control of a particular sub unit, e.g. by using mathematical models related to vehicle motion
    • H—ELECTRICITY
    • H02—GENERATION; CONVERSION OR DISTRIBUTION OF ELECTRIC POWER
    • H02M—APPARATUS FOR CONVERSION BETWEEN AC AND AC, BETWEEN AC AND DC, OR BETWEEN DC AND DC, AND FOR USE WITH MAINS OR SIMILAR POWER SUPPLY SYSTEMS; CONVERSION OF DC OR AC INPUT POWER INTO SURGE OUTPUT POWER; CONTROL OR REGULATION THEREOF
    • H02M3/00—Conversion of DC power input into DC power output
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2210/00—Converter types
    • B60L2210/10—DC to DC converters
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60L—PROPULSION OF ELECTRICALLY-PROPELLED VEHICLES; SUPPLYING ELECTRIC POWER FOR AUXILIARY EQUIPMENT OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRODYNAMIC BRAKE SYSTEMS FOR VEHICLES IN GENERAL; MAGNETIC SUSPENSION OR LEVITATION FOR VEHICLES; MONITORING OPERATING VARIABLES OF ELECTRICALLY-PROPELLED VEHICLES; ELECTRIC SAFETY DEVICES FOR ELECTRICALLY-PROPELLED VEHICLES
    • B60L2240/00—Control parameters of input or output; Target parameters
    • B60L2240/40—Drive Train control parameters
    • B60L2240/54—Drive Train control parameters related to batteries
    • B60L2240/545—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/244—Charge state
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2510/00—Input parameters relating to a particular sub-units
    • B60W2510/24—Energy storage means
    • B60W2510/242—Energy storage means for electrical energy
    • B60W2510/246—Temperature
    • B—PERFORMING OPERATIONS; TRANSPORTING
    • B60—VEHICLES IN GENERAL
    • B60W—CONJOINT CONTROL OF VEHICLE SUB-UNITS OF DIFFERENT TYPE OR DIFFERENT FUNCTION; CONTROL SYSTEMS SPECIALLY ADAPTED FOR HYBRID VEHICLES; ROAD VEHICLE DRIVE CONTROL SYSTEMS FOR PURPOSES NOT RELATED TO THE CONTROL OF A PARTICULAR SUB-UNIT
    • B60W2710/00—Output or target parameters relating to a particular sub-units
    • B60W2710/24—Energy storage means
    • B60W2710/242—Energy storage means for electrical energy
    • B60W2710/248—Current for loading or unloading
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/70—Energy storage systems for electromobility, e.g. batteries
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/7072—Electromobility specific charging systems or methods for batteries, ultracapacitors, supercapacitors or double-layer capacitors
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T10/00—Road transport of goods or passengers
    • Y02T10/60—Other road transportation technologies with climate change mitigation effect
    • Y02T10/72—Electric energy management in electromobility
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y02—TECHNOLOGIES OR APPLICATIONS FOR MITIGATION OR ADAPTATION AGAINST CLIMATE CHANGE
    • Y02T—CLIMATE CHANGE MITIGATION TECHNOLOGIES RELATED TO TRANSPORTATION
    • Y02T90/00—Enabling technologies or technologies with a potential or indirect contribution to GHG emissions mitigation
    • Y02T90/10—Technologies relating to charging of electric vehicles
    • Y02T90/14—Plug-in electric vehicles
    • Y—GENERAL TAGGING OF NEW TECHNOLOGICAL DEVELOPMENTS; GENERAL TAGGING OF CROSS-SECTIONAL TECHNOLOGIES SPANNING OVER SEVERAL SECTIONS OF THE IPC; TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10—TECHNICAL SUBJECTS COVERED BY FORMER USPC
    • Y10S—TECHNICAL SUBJECTS COVERED BY FORMER USPC CROSS-REFERENCE ART COLLECTIONS [XRACs] AND DIGESTS
    • Y10S903/00—Hybrid electric vehicles, HEVS
    • Y10S903/902—Prime movers comprising electrical and internal combustion motors
    • Y10S903/903—Prime movers comprising electrical and internal combustion motors having energy storing means, e.g. battery, capacitor
    • Y10S903/904—Component specially adapted for hev

Definitions

  • the present invention relates to a control method of a low voltage DC-DC converter for a hybrid vehicle that improves efficiency of a low voltage converter by varying application of output voltage of the low voltage converter based on drive modes and driving conditions of a hybrid vehicle.
  • a hybrid electric vehicle refers to a vehicle in which power sources are configured by an engine and a drive motor driven by power of a battery, and which promotes enhancement of fuel consumption with the assisting power of the motor driven by voltage of the battery when the vehicle is started or accelerated by combining the power sources to a front wheel.
  • a controller configured to operate the vehicle includes a hybrid control unit (HCU) or a vehicle control unit (VCU).
  • the HCU or VCU are configured to communicate with a motor control unit (MCU), which is a lower controller, by a predetermined type to adjust torque, speed, and generate torque amount of a motor as a power source, and communicate with an engine control unit (ECU), configured to adjust an engine generating power required for generating power as the assisted power source, to perform a relay control for engine starting and a failure diagnosis.
  • MCU motor control unit
  • ECU engine control unit
  • the HCU is configured to communicate with a battery management system (BMS) configured to manage the battery by detecting temperature, voltage, current, state of charge (SOC), and so on, of the battery to adjust torque and speed of the motor based on conditions of SOC, and communicate with a transmission control unit (TCU) configured to adjust gear ratio based on a vehicle speed and a drive command of a driver to maintain a vehicle speed required by the driver.
  • BMS battery management system
  • SOC state of charge
  • TCU transmission control unit
  • the communication between the HCU as the higher controller and the lower controllers is performed by a controller area network (CAN) bus to exchange information with each other and transmit/receive control signals.
  • CAN controller area network
  • the electric vehicle includes a low voltage DC/DC converter (LDC), this is, DC-DC converter configured to convert electric power of a high voltage battery to direct current (DC).
  • the LDC is configured to convert DC to alternating current (AC), increase or decrease voltage using a coil, a trance, a capacitance, and so on, and then, generate DC to supply electricity that corresponds to voltage used in each electric field load.
  • LDC low voltage converter
  • many technologies have been developed.
  • a technology in the related art involves a method for improving output efficiency by turning off the LDC as a voltage drop device when high output is required in a vehicle.
  • this technology merely controls on/off of the low voltage converter based on a vehicle condition, and does not adjust output voltage of the low voltage converter when the low voltage converter is on to improve efficiency of the low voltage converter.
  • the present invention provides a control method of a low voltage DC-DC converter for a hybrid vehicle having advantages of improving output voltage efficiency of the low voltage converter by varying the application of output voltage of a low voltage converter for a hybrid vehicle based on drive modes and driving conditions of a hybrid vehicle, and including a determining logic applying hysteresis thereto when determining conditions information of a vehicle.
  • a control method of a low voltage DC-DC converter for a hybrid vehicle may include: determining a vehicle drive mode by a controller of a low voltage converter; determining vehicle driving condition by the controller; determining vehicle condition information including a motor output alteration and a gear mode by the controller; determining an output mode of the low voltage converter based on the drive mode, the driving condition, and the condition information by the controller; and adjusting an output voltage of the low voltage converter based on temperature and SOC of a battery by the controller in the determined output mode.
  • the determination of a vehicle drive mode may include determining, by the controller, the vehicle drive mode by receiving the vehicle drive mode detected by a vehicle controller.
  • the vehicle drive mode detected by the vehicle controller may include an electric vehicle mode, a deceleration mode, an idle mode, a partial load mode, a maximum load mode, and a series mode.
  • the controller may be configured to determine the vehicle driving condition by separating a drive, a coasting deceleration, and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode.
  • the determination of an output mode may include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode.
  • the determination of an output mode may include determining the output mode of the low voltage converter as a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the drive, and the gear mode is a drive mode.
  • the output mode may further be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode.
  • the step of determination an output mode may include determining the output mode of the low voltage converter as a second output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode.
  • the controller may be configured to determine the vehicle driving condition by separating a coasting deceleration and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode.
  • the determination of an output mode may include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode.
  • the output mode may be determined to be a first output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode.
  • the output mode may be determined to be a second output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode.
  • the output mode may further be determined to be a first output mode when the vehicle drive mode is the idle mode.
  • the controller may be configured to determine a vehicle driving condition by separating an engine charging and a motor assistance when the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode.
  • the determination of an output mode may further include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode.
  • the determination of an output mode may include determining the output mode of the low voltage converter to be a third output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the engine charging, and the gear mode is a drive mode.
  • the output mode may also be determined as a first output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the motor assistance, and the gear mode is a drive mode.
  • the output mode may be determined to be a first output mode when the vehicle drive mode is the maximum load mode.
  • the output mode may be determined to be a first output mode when the vehicle drive mode is the series mode.
  • a low voltage converter control system for a hybrid vehicle may include: a low voltage converter configured to convert high voltage to low voltage; a vehicle controller configured to detect a vehicle drive mode; and a controller of low voltage converter configured to determine an output mode of the low voltage converter based on the drive mode, a driving condition of a vehicle and a vehicle condition information detected by the vehicle controller, and adjust an output voltage of the low voltage converter using temperature and SOC of a battery in the determined output mode.
  • the control method of a low voltage DC-DC converter for a hybrid vehicle according to the present invention may derive effects as follows.
  • unnecessary mode transition problem may be solved in a process of determining a drive mode by a low voltage converter controller as contrasted with a conventional art.
  • control robustness may be ensured by separating hysteresis with respect to motor power input to optimize and use it when determining each drive mode.
  • FIG. 1 is a flow chart of a control method of a low voltage DC-DC converter for a hybrid vehicle according to an exemplary embodiment of the present invention.
  • FIG. 2 is a drawing showing a control system of a low voltage converter for a hybrid vehicle according to an exemplary embodiment of the present invention.
  • vehicle or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum).
  • a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
  • controller/control unit refers to a hardware device that includes a memory and a processor.
  • the memory is configured to store the modules and the processor is specifically configured to execute said modules to perform one or more processes which are described further below.
  • the term “about” is understood as within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. “About” can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values provided herein are modified by the term “about.”
  • a control method of a low voltage converter 10 for a hybrid vehicle may include determining a vehicle drive mode by a controller 20 of the low voltage converter 10 (S 10 ); determining a vehicle driving condition by the controller 20 (S 20 ); determining vehicle condition information including a motor output alteration and a gear mode by the controller 20 (S 30 ); determining an output mode of the low voltage converter 10 by the controller 20 using the drive mode, the driving condition, and the condition information (S 40 ); and adjusting an output voltage of the low voltage converter 10 using temperature and SOC of a battery in the determined output mode by the controller 20 (S 50 ) as shown in FIG. 1 .
  • the controller 20 may be configured to receive vehicle drive modes detected by a vehicle controller 30 to determine a vehicle drive mode.
  • the vehicle controller 30 which may be a controller configured to execute global operation for vehicle driving, may be a higher controller in comparison with the controller 20 (e.g., a subordinate controller) of the low voltage converter 10 .
  • the vehicle drive modes detected from the vehicle controller 30 may vary based on conditions and type of a vehicle.
  • the vehicle drive modes according to an exemplary embodiment of the present invention may include an electric vehicle mode, a deceleration mode, an idle mode, a partial load mode, a maximum load mode, and a series mode.
  • the electric vehicle mode indicates a mode in which a hybrid vehicle is driven by using a battery without driving an engine.
  • speed is reduced and in the idle mode, an engine is not driven.
  • load transmitted to a vehicle by vehicle driving is not maximum in the maximum load mode, load transmitted to a vehicle is maximum, and the series mode indicates when a hybrid vehicle is a series mode among a parallel mode and a series mode.
  • the controller 20 may be configured to detect a vehicle driving condition after the vehicle drive mode is determined to as mode among the above mentioned plurality of modes.
  • the controller 20 may further be configured to determine a vehicle driving condition by separating a drive, a coasting deceleration, and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the electric vehicle mode.
  • the detection of the output mode may include considering condition information of a vehicle including motor output alteration applying hysteresis by the controller 20 when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the electric vehicle mode.
  • the hysteresis may be used to determine the regenerative braking deceleration and may be realized using one-dimension map data based on a vehicle speed.
  • an output value may be 1 during the regenerative braking deceleration and an output value may be 0 not during the regenerative braking deceleration.
  • the output mode of the low voltage converter 10 may be determined based on the gear mode. According to the present invention, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the drive, and the gear mode is the drive mode. Additionally, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the coasting deceleration, and the gear mode is the drive mode.
  • the output mode of the low voltage converter 10 may be determined to be a second output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is the drive mode.
  • the first output mode and the second output mode may have different output voltages of the low voltage converter 10 , and generally, the output voltage of the first output mode may be an output voltage of an EV mode and the output voltage of the second output mode may be an output voltage of a regeneration mode.
  • the controller 20 may be configured to determine the vehicle driving condition by separating the coasting deceleration and the regenerative braking deceleration (e.g., considering the decelerations separately) when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the deceleration mode.
  • the determination of the output mode may include considering condition information of a vehicle including motor output alteration applying hysteresis by the controller 20 to be same with the above mentioned method.
  • the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the coasting deceleration, and the gear mode is the drive mode, and the output mode of the low voltage converter 10 may be determined to be a second output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is the drive mode.
  • the output mode of the low voltage converter 10 may further be determined to be a first output mode regardless of vehicle driving condition when the vehicle drive mode is the idle mode.
  • the controller 20 may be configured to determine a vehicle driving condition by separating an engine charging and a motor assistance when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the partial load mode.
  • the hysteresis may be applied to motor output alteration similar to the above mentioned electric vehicle mode.
  • the hysteresis may be used to determine motor assistance and may be deduced through a map data having a vehicle speed as input and a motor output variation as output.
  • an output value may be 1 in response to determining that the motor assistance is operating and an output value may be 0 in response to determining that the motor assistance is not operating.
  • the output mode of the low voltage converter 10 may be determined to be a third output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the engine charging, and the gear mode is the drive mode, and the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the motor assistance, and the gear mode is the drive mode.
  • the first output mode may indicate the output voltage in the above mentioned EV mode and the third output mode as charging voltage in the engine charging mode may be a charging mode of a vehicle based on that a vehicle driving state is in an engine charging state.
  • the output mode of the low voltage converter 10 may be determined without separating the driving condition when the vehicle drive mode is the maximum load mode and the series mode. According to the present invention, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the maximum load mode and the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the series mode, too.
  • a low voltage converter control system for a hybrid vehicle may include a low voltage converter 10 configured to convert high voltage to low voltage; a vehicle controller 30 configured to detect a vehicle drive mode; and a controller 20 configured to determine an output mode of the low voltage converter 10 using a drive mode, driving conditions of a vehicle and vehicle conditions information detected by the vehicle controller 30 , and adjusting an output voltage of the low voltage converter 10 using temperature and SOC of a battery in the determined output mode.

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Abstract

A control method of a low voltage DC-DC converter for a hybrid vehicle is provided. The method includes determining a vehicle drive mode, determining vehicle driving condition, and determining vehicle condition information including a motor output alteration and a gear mode. Further, an output mode of the low voltage converter is determined based to the drive mode, the driving condition, and the condition information and an output voltage of the low voltage converter is adjusted based on temperature and SOC of a battery in the determined output mode.

Description

CROSS REFERENCE TO RELATED APPLICATION
The present application claims priority of Korean Patent Application No. 10-2015-0173513 filed on Dec. 7, 2015, the entire contents of which is incorporated herein for all purposes by this reference.
BACKGROUND
Field of the Invention
The present invention relates to a control method of a low voltage DC-DC converter for a hybrid vehicle that improves efficiency of a low voltage converter by varying application of output voltage of the low voltage converter based on drive modes and driving conditions of a hybrid vehicle.
Description of the Related Art
In general, a hybrid electric vehicle refers to a vehicle in which power sources are configured by an engine and a drive motor driven by power of a battery, and which promotes enhancement of fuel consumption with the assisting power of the motor driven by voltage of the battery when the vehicle is started or accelerated by combining the power sources to a front wheel.
In an electric vehicle, a controller configured to operate the vehicle includes a hybrid control unit (HCU) or a vehicle control unit (VCU). The HCU or VCU are configured to communicate with a motor control unit (MCU), which is a lower controller, by a predetermined type to adjust torque, speed, and generate torque amount of a motor as a power source, and communicate with an engine control unit (ECU), configured to adjust an engine generating power required for generating power as the assisted power source, to perform a relay control for engine starting and a failure diagnosis.
In addition, the HCU is configured to communicate with a battery management system (BMS) configured to manage the battery by detecting temperature, voltage, current, state of charge (SOC), and so on, of the battery to adjust torque and speed of the motor based on conditions of SOC, and communicate with a transmission control unit (TCU) configured to adjust gear ratio based on a vehicle speed and a drive command of a driver to maintain a vehicle speed required by the driver. The communication between the HCU as the higher controller and the lower controllers is performed by a controller area network (CAN) bus to exchange information with each other and transmit/receive control signals.
Meanwhile, the electric vehicle includes a low voltage DC/DC converter (LDC), this is, DC-DC converter configured to convert electric power of a high voltage battery to direct current (DC). The LDC is configured to convert DC to alternating current (AC), increase or decrease voltage using a coil, a trance, a capacitance, and so on, and then, generate DC to supply electricity that corresponds to voltage used in each electric field load.
For controlling the low voltage converter (LDC), many technologies have been developed. For example, a technology in the related art involves a method for improving output efficiency by turning off the LDC as a voltage drop device when high output is required in a vehicle. However, this technology merely controls on/off of the low voltage converter based on a vehicle condition, and does not adjust output voltage of the low voltage converter when the low voltage converter is on to improve efficiency of the low voltage converter.
The foregoing is intended merely to aid in the understanding of the background of the present invention, and is not intended to mean that the present invention falls within the purview of the related art that is already known to those skilled in the art.
SUMMARY
The present invention provides a control method of a low voltage DC-DC converter for a hybrid vehicle having advantages of improving output voltage efficiency of the low voltage converter by varying the application of output voltage of a low voltage converter for a hybrid vehicle based on drive modes and driving conditions of a hybrid vehicle, and including a determining logic applying hysteresis thereto when determining conditions information of a vehicle.
A control method of a low voltage DC-DC converter for a hybrid vehicle according to the present invention may include: determining a vehicle drive mode by a controller of a low voltage converter; determining vehicle driving condition by the controller; determining vehicle condition information including a motor output alteration and a gear mode by the controller; determining an output mode of the low voltage converter based on the drive mode, the driving condition, and the condition information by the controller; and adjusting an output voltage of the low voltage converter based on temperature and SOC of a battery by the controller in the determined output mode.
The determination of a vehicle drive mode may include determining, by the controller, the vehicle drive mode by receiving the vehicle drive mode detected by a vehicle controller. The vehicle drive mode detected by the vehicle controller may include an electric vehicle mode, a deceleration mode, an idle mode, a partial load mode, a maximum load mode, and a series mode. The controller may be configured to determine the vehicle driving condition by separating a drive, a coasting deceleration, and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode.
The determination of an output mode may include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode. In addition, the determination of an output mode may include determining the output mode of the low voltage converter as a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the drive, and the gear mode is a drive mode. The output mode may further be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode.
Further, the step of determination an output mode may include determining the output mode of the low voltage converter as a second output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode. The controller may be configured to determine the vehicle driving condition by separating a coasting deceleration and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode.
The determination of an output mode may include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode. The output mode may be determined to be a first output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode. In addition, the output mode may be determined to be a second output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode.
The output mode may further be determined to be a first output mode when the vehicle drive mode is the idle mode. The controller may be configured to determine a vehicle driving condition by separating an engine charging and a motor assistance when the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode. The determination of an output mode may further include utilizing condition information of a vehicle such as motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode.
Furthermore, the determination of an output mode may include determining the output mode of the low voltage converter to be a third output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the engine charging, and the gear mode is a drive mode. The output mode may also be determined as a first output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the motor assistance, and the gear mode is a drive mode. Additionally, the output mode may be determined to be a first output mode when the vehicle drive mode is the maximum load mode. The output mode may be determined to be a first output mode when the vehicle drive mode is the series mode.
A low voltage converter control system for a hybrid vehicle according to the present invention may include: a low voltage converter configured to convert high voltage to low voltage; a vehicle controller configured to detect a vehicle drive mode; and a controller of low voltage converter configured to determine an output mode of the low voltage converter based on the drive mode, a driving condition of a vehicle and a vehicle condition information detected by the vehicle controller, and adjust an output voltage of the low voltage converter using temperature and SOC of a battery in the determined output mode.
The control method of a low voltage DC-DC converter for a hybrid vehicle according to the present invention may derive effects as follows.
Firstly, unnecessary mode transition problem may be solved in a process of determining a drive mode by a low voltage converter controller as contrasted with a conventional art.
Secondly, control robustness may be ensured by separating hysteresis with respect to motor power input to optimize and use it when determining each drive mode.
BRIEF DESCRIPTION OF THE DRAWINGS
The above and other features of the present invention will now be described in detail with reference to exemplary embodiments thereof illustrated in the accompanying drawings which are given hereinbelow by way of illustration only, and thus are not limitative of the present invention, and wherein:
FIG. 1 is a flow chart of a control method of a low voltage DC-DC converter for a hybrid vehicle according to an exemplary embodiment of the present invention; and
FIG. 2 is a drawing showing a control system of a low voltage converter for a hybrid vehicle according to an exemplary embodiment of the present invention.
 DETAILED DESCRIPTION
It is understood that the term “vehicle” or “vehicular” or other similar term as used herein is inclusive of motor vehicles in general such as passenger automobiles including sports utility vehicles (SUV), buses, trucks, various commercial vehicles, watercraft including a variety of boats and ships, aircraft, and the like, and includes hybrid vehicles, electric vehicles, plug-in hybrid electric vehicles, hydrogen-powered vehicles and other alternative fuel vehicles (e.g. fuels derived from resources other than petroleum). As referred to herein, a hybrid vehicle is a vehicle that has two or more sources of power, for example both gasoline-powered and electric-powered vehicles.
Although exemplary embodiment is described as using a plurality of units to perform the exemplary process, it is understood that the exemplary processes may also be performed by one or plurality of modules. Additionally, it is understood that the term controller/control unit refers to a hardware device that includes a memory and a processor. The memory is configured to store the modules and the processor is specifically configured to execute said modules to perform one or more processes which are described further below.
The terminology used herein is for the purpose of describing particular embodiments only and is not intended to be limiting of the invention. As used herein, the singular forms “a”, “an” and “the” are intended to include the plural forms as well, unless the context clearly indicates otherwise. It will be further understood that the terms “comprises” and/or “comprising,” when used in this specification, specify the presence of stated features, integers, steps, operations, elements, and/or components, but do not preclude the presence or addition of one or more other features, integers, steps, operations, elements, components, and/or groups thereof. As used herein, the term “and/of” includes any and all combinations of one or more of the associated listed items.
Unless specifically stated or obvious from context, as used herein, the term “about” is understood as within a range of normal tolerance in the art, for example within 2 standard deviations of the mean. “About” can be understood as within 10%, 9%, 8%, 7%, 6%, 5%, 4%, 3%, 2%, 1%, 0.5%, 0.1%, 0.05%, or 0.01% of the stated value. Unless otherwise clear from the context, all numerical values provided herein are modified by the term “about.”
The exemplary embodiments of the present invention will be described below with reference to the accompanying drawings.
A control method of a low voltage converter 10 for a hybrid vehicle according to the present invention may include determining a vehicle drive mode by a controller 20 of the low voltage converter 10 (S10); determining a vehicle driving condition by the controller 20 (S20); determining vehicle condition information including a motor output alteration and a gear mode by the controller 20 (S30); determining an output mode of the low voltage converter 10 by the controller 20 using the drive mode, the driving condition, and the condition information (S40); and adjusting an output voltage of the low voltage converter 10 using temperature and SOC of a battery in the determined output mode by the controller 20 (S50) as shown in FIG. 1.
In the determination of a vehicle drive mode (S10), the controller 20 may be configured to receive vehicle drive modes detected by a vehicle controller 30 to determine a vehicle drive mode. Herein, the vehicle controller 30, which may be a controller configured to execute global operation for vehicle driving, may be a higher controller in comparison with the controller 20 (e.g., a subordinate controller) of the low voltage converter 10. The vehicle drive modes detected from the vehicle controller 30 may vary based on conditions and type of a vehicle. The vehicle drive modes according to an exemplary embodiment of the present invention may include an electric vehicle mode, a deceleration mode, an idle mode, a partial load mode, a maximum load mode, and a series mode.
The electric vehicle mode indicates a mode in which a hybrid vehicle is driven by using a battery without driving an engine. In the deceleration mode, speed is reduced and in the idle mode, an engine is not driven. Additionally, in the partial load mode, load transmitted to a vehicle by vehicle driving is not maximum in the maximum load mode, load transmitted to a vehicle is maximum, and the series mode indicates when a hybrid vehicle is a series mode among a parallel mode and a series mode.
The controller 20 may be configured to detect a vehicle driving condition after the vehicle drive mode is determined to as mode among the above mentioned plurality of modes. The controller 20 may further be configured to determine a vehicle driving condition by separating a drive, a coasting deceleration, and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the electric vehicle mode. In addition, the detection of the output mode may include considering condition information of a vehicle including motor output alteration applying hysteresis by the controller 20 when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the electric vehicle mode. The hysteresis may be used to determine the regenerative braking deceleration and may be realized using one-dimension map data based on a vehicle speed. In particular, in the hysteresis, an output value may be 1 during the regenerative braking deceleration and an output value may be 0 not during the regenerative braking deceleration.
After the vehicle drive mode and the driving condition are determined, the output mode of the low voltage converter 10 may be determined based on the gear mode. According to the present invention, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the drive, and the gear mode is the drive mode. Additionally, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the coasting deceleration, and the gear mode is the drive mode. Further, the output mode of the low voltage converter 10 may be determined to be a second output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is the drive mode. The first output mode and the second output mode may have different output voltages of the low voltage converter 10, and generally, the output voltage of the first output mode may be an output voltage of an EV mode and the output voltage of the second output mode may be an output voltage of a regeneration mode.
Moreover, the controller 20 may be configured to determine the vehicle driving condition by separating the coasting deceleration and the regenerative braking deceleration (e.g., considering the decelerations separately) when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the deceleration mode. In particularly, the determination of the output mode may include considering condition information of a vehicle including motor output alteration applying hysteresis by the controller 20 to be same with the above mentioned method.
In addition, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the coasting deceleration, and the gear mode is the drive mode, and the output mode of the low voltage converter 10 may be determined to be a second output mode when the vehicle drive mode is the deceleration mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is the drive mode. The output mode of the low voltage converter 10 may further be determined to be a first output mode regardless of vehicle driving condition when the vehicle drive mode is the idle mode.
Moreover, the controller 20 may be configured to determine a vehicle driving condition by separating an engine charging and a motor assistance when the vehicle drive mode transmitted from the vehicle controller 30 to the controller 20 is the partial load mode. In particular, the hysteresis may be applied to motor output alteration similar to the above mentioned electric vehicle mode. The hysteresis may be used to determine motor assistance and may be deduced through a map data having a vehicle speed as input and a motor output variation as output. In addition, an output value may be 1 in response to determining that the motor assistance is operating and an output value may be 0 in response to determining that the motor assistance is not operating.
The output mode of the low voltage converter 10 may be determined to be a third output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the engine charging, and the gear mode is the drive mode, and the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the motor assistance, and the gear mode is the drive mode. The first output mode may indicate the output voltage in the above mentioned EV mode and the third output mode as charging voltage in the engine charging mode may be a charging mode of a vehicle based on that a vehicle driving state is in an engine charging state.
Furthermore, the output mode of the low voltage converter 10 may be determined without separating the driving condition when the vehicle drive mode is the maximum load mode and the series mode. According to the present invention, the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the maximum load mode and the output mode of the low voltage converter 10 may be determined to be a first output mode when the vehicle drive mode is the series mode, too.
In addition, a low voltage converter control system for a hybrid vehicle according to the present invention may include a low voltage converter 10 configured to convert high voltage to low voltage; a vehicle controller 30 configured to detect a vehicle drive mode; and a controller 20 configured to determine an output mode of the low voltage converter 10 using a drive mode, driving conditions of a vehicle and vehicle conditions information detected by the vehicle controller 30, and adjusting an output voltage of the low voltage converter 10 using temperature and SOC of a battery in the determined output mode.
Although the exemplary embodiments of the present invention have been disclosed for illustrative purposes, those skilled in the art will appreciate that various modifications, additions and substitutions are possible, without departing from the scope and spirit of the invention as disclosed in the accompanying claims.

Claims (20)

What is claimed is:
1. A control method of a low voltage direct current-direct current (DC-DC) converter for a hybrid vehicle, comprising:
determining, by a controller of a low voltage converter, a vehicle drive mode;
determining, by the controller, vehicle driving condition;
determining, by the controller, vehicle condition information including a motor output alteration and a gear mode;
determining, by the controller, an output mode of the low voltage converter based on the drive mode, the driving condition, and the condition information; and
adjusting, by the controller, an output voltage of the low voltage converter based on temperature and state of charge (SOC) of a battery in the determined output mode.
2. The control method of claim 1, wherein the determination of a vehicle drive mode includes determining, by the controller, the vehicle drive mode by receiving the vehicle drive mode detected by a vehicle controller.
3. The control method of claim 2, wherein the detected vehicle drive mode detected includes an electric vehicle mode, a deceleration mode, an idle mode, a partial load mode, a maximum load mode, and a series mode.
4. The control method of claim 3, wherein the controller is configured to determine the vehicle driving condition by separating a drive, a coasting deceleration, and a regenerative braking deceleration when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode.
5. The control method of claim 3, wherein the determination of an output mode is based on condition information of a vehicle including motor output alteration applying hysteresis by the controller when the vehicle drive mode transmitted from the vehicle controller to the controller is the electric vehicle mode.
6. The control method of claim 4, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the drive, and the gear mode is a drive mode.
7. The control method of claim 4, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a first output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode.
8. The control method of claim 4, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a second output mode when the vehicle drive mode is the electric vehicle mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode.
9. The control method of claim 3, wherein the controller is configured to determine the vehicle driving condition by separating a coasting deceleration and a regenerative braking deceleration in a case that the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode.
10. The control method of claim 3, wherein the step of deciding an output mode uses condition information of a vehicle including motor output alteration applying hysteresis by the controller in a case that the vehicle drive mode transmitted from the vehicle controller to the controller is the deceleration mode.
11. The control method of claim 9, wherein the step of deciding an output mode decides the output mode of the low voltage converter to a first output mode in a case that the vehicle drive mode is the deceleration mode, the vehicle driving condition is the coasting deceleration, and the gear mode is a drive mode.
12. The control method of claim 9, wherein the step of deciding an output mode decides the output mode of the low voltage converter to a second output mode in a case that the vehicle drive mode is the deceleration mode, the vehicle driving condition is the regenerative braking deceleration, and the gear mode is a drive mode.
13. The control method of claim 3, wherein the step of deciding an output mode decides the output mode of the low voltage converter to a first output mode in a case that the vehicle drive mode is the idle mode.
14. The control method of claim 3, wherein the controller determines a vehicle driving condition by separating an engine charging and a motor assistance in a case that the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode.
15. The control method of claim 3, wherein the step of deciding an output mode uses condition information of a vehicle including motor output alteration applying hysteresis by the controller in a case that the vehicle drive mode transmitted from the vehicle controller to the controller is the partial load mode.
16. The control method of claim 14, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a third output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the engine charging, and the gear mode is a drive mode.
17. The control method of claim 14, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a first output mode when the vehicle drive mode is the partial load mode, the vehicle driving condition is the motor assistance, and the gear mode is a drive mode.
18. The control method of claim 3, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a first output mode when the vehicle drive mode is the maximum load mode.
19. The control method of claim 3, wherein the determination of an output mode includes determining the output mode of the low voltage converter to be a first output mode when the vehicle drive mode is the series mode.
20. A low voltage converter control system for a hybrid vehicle, comprising:
a low voltage converter configured to convert high voltage to low voltage;
a vehicle controller configured to detect a vehicle drive mode; and
a controller of low voltage converter configured to determine an output mode of the low voltage converter using the drive mode, a driving condition of a vehicle and a vehicle condition information detected by the vehicle controller, and adjust an output voltage of the low voltage converter using temperature and state of charge (SOC) of a battery in the determined output mode.
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US20160121725A1 (en) * 2014-11-05 2016-05-05 Hyundai Motor Company Method and system for variably adjusting voltage of ldc for hybrid vehicle

Cited By (2)

* Cited by examiner, † Cited by third party
Publication number Priority date Publication date Assignee Title
CN108859767A (en) * 2018-06-08 2018-11-23 安徽江淮汽车集团股份有限公司 A kind of control method of hybrid vehicle DCDC
CN108859767B (en) * 2018-06-08 2020-06-23 安徽江淮汽车集团股份有限公司 Control method of hybrid electric vehicle DCDC

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